Danfoss VLT 6000 HVAC Manual de Serviço descarregar pdf (Página 161)

VLT

6000 HVAC

161MG.60.B1.02 - VLT is a registered Danfoss trade mark

All about

VLT 6000 HVAC

■■

■ Derating for running at low speed

When a centrifugal pump or a fan is controlled by a

VLT 6000 HVAC frequency converter, it is not

necessary to reduce the output current at low speed

because the load characterstic of the centrifugal

pumps/fans, automatically ensures the necessary

reduction.

■■

■ Derating for long motor cables or cables with

larger cross-section

VLT 6000 HVAC has been tested using 300 m

unscreened/unarmoured cable and 150 m screened/

armoured cable.

VLT 6000 HVAC has been designed to work using a

motor cable with a rated cross-section. If a cable with

a larger cross-section is to be used, it is recom-

mended to reduce the output current by 5% for every

step the cross-section is increased.

(Increased cable cross-section leads to increased

capacity to earth, and thus an increased earth leak-

age current).

Switching frequency [kHz] Min. Max. Fact.

VLT 6002-6005, 200 V 3.0 10.0 4.5

VLT 6006-6032, 200 V 3.0 14.0 4.5

VLT 6001-6011, 460 V 3.0 10.0 4.5

VLT 6016-6062, 460 V 3.0 14.0 4.5

VLT 6075-6275, 406 V 3.0 4.5 4.5

■■

■ Vibration and shock

VLT 6000 HVAC has been tested according to a pro-

cedure based on the following standards:

IEC 68-2-6: Vibration (sinusoidal) - 1970

IEC 68-2-34: Random vibration broad-band

- general requirements

IEC 68-2-35: Random vibration broad-band

- high reproducibility

IEC 68-2-36: Random vibration broad-band

- medium reproducibility

VLT 6000 HVAC complies with requirements that

correspond to conditions when the unit is mounted

on the walls and floors of production premises, as

well as in panels bolted to walls or floors.

■■

■ Motor thermal protection

The motor temperature is calculated on the basis of

motor current, output frequency and time. See page 59.

■■

■ Air humidity

VLT 6000 HVAC has been designed to meet the IEC

68-2-3 standard, EN 50178 pkt. 9.4.2.2/DIN 40040,

class E, at 40°C.

See specifications under General technical data.

■■

■ Derating for high switching frequency

A higher switching frequency (to be set in parameter

407 Switching frequency) leads to higher losses in

the electronics of the VLT frequency converter.

VLT 6000 HVAC has a pulse pattern in which it is

possible to set the switching frequency from 3.0-

10.0/14.0 kHz.

The VLT frequency converter will automatically derate

the rated output current I

VLT,N

, when the switching

frequency exceeds 4.5 kHz.

In both cases, the reduction is carried out linearly,

down to 60% of I

VLT,N

The table gives the min., max. and factory-set

switching frequencies for VLT 6000 HVAC units.

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 176 177

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